Steam-boiler.



No. 650,598. Patented May 29, l900. J. B. CRABILL.

STEAM BOILER.

v (Application filed Jan. 29, 1900.) (No Model.)

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NITED STATES PATENT OFFICE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 650,598, dated May 29, 1900.

Application filed January 29, 1900. Serial No. 3,250. (No model.)

To all whom, it may concern:

Be it known that I, J OSEPH R. CRABILL, a citizen of the United States, residing at La Harpe, county of Hancock, State of Illinois, have invented anew and useful Improvement in Steam-Boilers, of which the following is a specification.

My invention relates to the separation of dry steam from the water in a steam-boiler when generating and delivering the steam rapidly for use.

My invention consists of a system of one or more suitably-shaped pipes "or passage-ways for steam from parts of the generator that are distant from the dome to the upper interior part of the dome, in addition to the usual passage-way through the base of the dome, furnishing free passage-way for steam through any water that may be in the way from any cause.

The objects of my invention are to prevent priming and foaming andto furnish dry steam to the upper part of the dome of boiler when steam is rapidly drawn or escapes from it for use or relief; also, allowing water-line to be carried higher under similar conditions,thereby raising the factor of safety; also, preventing water from working over from waves and sloshing in generator of traction-engines when operating on rough roads. I attain these objects by mechanism illustrated in the accompanying drawings, in which Figure 1 is a sectional elevation of the upper part of a steam-boiler with my device in place. Fig. 2 is a perspective view of one of the pipes of my devices, shown separately.

Similar letters of reference refer to similar parts throughout both views.

In reference to the drawings, A shows the interior of a steam-boiler, with dome B. The dotted line E is the water-line, with steamspace S S above it. p

O and D are L-shaped pipes or passageways for steam, having free opening through them, with one end opening into steam-space S S in part of boilerA that is distant from the dome B and the other end opening into the upper part K of the dome B, and they are in no way connected with the steam-pipe F,

which conveys steam from the boiler A. The

usual opening from the generating part of the boiler A into the base of the dome B is not bers can be used to advantage in some of the forms of steam=geueratingboilers. The steam pipes and passage-ways C and D should be large enough for either of them, regardless of number, to furnish a free and ample passage way for a volume of steam equal to the entire output of the generator, but are only called on to act as such passages in any sensible degree when conditions arise that are herein after described.

The operation of my invention in supply ing steam into the top of the dome B when the capacity of the generator A is drawn on heavily through and by the steam-pipe F can be best understood by what takes place in a steam-generator when foaming and priming are in progress. I find by observing the illuminated interior of a steam-generator when foaming and priming progresses and the steam is drawn rapidly from the dome that at first there is a foaming and frothing on the surface of the water. Then a cone of foaming water forms and begins to rise directly under the dome and continues to rise until it reaches the base of the dome and shuts off or obstructs the dry steam in its passage from the distant end of the generator to the top of the dome. The dry steam in the end of the generator by its rapid generation and expan sion forces the water and foam in and near the base of the dome upward and delivers it into the steam-pipe F. When water is thus raised in any part of a steam-generator, it is correspondingly lowered in other parts.

In operating a steam-generator embodying and embracing my device the steam passageways 0 and D furnish free and unobstructed passages for dry steam from the parts of the generator which are distant from the dome to the upper part of the dome through any water or foam that may intervene from any cause.

My device is self operative and will in= stantly, at any and all times, deliver the driest steam from where the water is the lowest in a generator to the upper part of the dome B, from which it is drawn by the steampipe F for use.

My device has no moving parts and requires What I claim, and desire to secure by Letters no ulterior force to cause it to act, but de- Patent, ispends on thedifierent weights of dry steam, In a steam-generator, the combination with Wet steam, foam, and Water to operate it. the steam-dome, open-ended pipes forming an 5 I do not confine myself in the application collectors, extending from the upper interior of my device to any form of steam-generator of said dome to distant parts of the generor any specific form of dome, and my device ator above the water-line thereof, whereby is just as effective when the steam-chest of steam may be collected and delivered into an engine is made'to act as a dome. Nor do said dome in addition to the ordinary open 25 10 I contemplate the use of any particular shape bottom thereof, and foaming is-prevented, as

of pipes or passage-ways C and 1), except and for the purpose described. they have no opening into them for the passage of steam other than at their ends. Any" e t V, JO E ORABILL' shaped pipe, however formed, or any form of" Witnesses: I 5 cross-section may be used. C. H. INGRAHAM,

Having thus fully described my invention, R. B. WILLIAMS. 

